Lakes / Utah / Iron County / Newcastle Reservoir
Newcastle Reservoir, Utah
151.48 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Utah
37.65 degrees N, 113.52 degrees W - Iron County. State and county outlines drawn from Census boundary data; the lake marker is placed by its USGS National Hydrography Dataset coordinates, not by eye. Schematic - not a survey map.
How Newcastle Reservoir Stacks Up
- Larger than 62% of the 298 lakes counted in Utah.
- About 38 miles from St. George, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Mud Lake | Iron | 15 mi | 38.4 acres |
| Quichapa Lake | Iron | 17 mi | 1,663.76 acres |
| Baker Reservoir | Washington | 20 mi | 40.28 acres |
| Lower Enterprise Reservoir | Washington | 20 mi | 49.92 acres |
| Upper Enterprise Reservoir | Washington | 21 mi | 354 acres |
| Ash Creek Reservoir | Washington | 22 mi | 54.61 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Newcastle Reservoir
How Big Is Newcastle Reservoir?
Newcastle Reservoir covers 151.48 acres in Iron County, Utah.
What Is the Largest Lake in Iron County?
Quichapa Lake is the largest lake in Iron County, at 1,663.76 acres.
Largest Lakes in Utah
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Great Salt Lake | Box Elder | 925,981.5 acres | - |
| 2 | Lake Powell | Kane | 128,544.01 acres | - |
| 3 | Sevier Lake | Millard | 122,527.82 acres | - |
| 4 | Utah Lake | Utah | 91,155.46 acres | - |
| 5 | Bear Lake | Rich | 70,008.54 acres | - |
All 298 Utah lakes ranked by surface area
Sources: USGS National Hydrography Dataset (The National Map) lake data (ID 79030830). Verified October 30, 2026.